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iwlwifi: move rate helpers to iwlcore
[linux-2.6/cjktty.git] / drivers / net / wireless / iwlwifi / iwl-4965-rs.c
blobb9a4e4b19ab524d0a62f249a8c2999e82a75d5d3
1 /******************************************************************************
2 *
3 * Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
17 *
18 * The full GNU General Public License is included in this distribution in the
19 * file called LICENSE.
20 *
21 * Contact Information:
22 * James P. Ketrenos <ipw2100-admin@linux.intel.com>
23 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
24 *
25 *****************************************************************************/
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/skbuff.h>
29 #include <linux/wireless.h>
30 #include <net/mac80211.h>
31
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/delay.h>
35
36 #include <linux/workqueue.h>
37
38 #include "../net/mac80211/rate.h"
39
40 #include "iwl-dev.h"
41 #include "iwl-core.h"
42 #include "iwl-helpers.h"
43
44 #define RS_NAME "iwl-4965-rs"
45
46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
47 #define IWL_NUMBER_TRY 1
48 #define IWL_HT_NUMBER_TRY 3
49
50 #define IWL_RATE_MAX_WINDOW 62 /* # tx in history window */
51 #define IWL_RATE_MIN_FAILURE_TH 6 /* min failures to calc tpt */
52 #define IWL_RATE_MIN_SUCCESS_TH 8 /* min successes to calc tpt */
53
54 /* max time to accum history 2 seconds */
55 #define IWL_RATE_SCALE_FLUSH_INTVL (2*HZ)
56
57 static u8 rs_ht_to_legacy[] = {
58 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
59 IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
60 IWL_RATE_6M_INDEX,
61 IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
62 IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
63 IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
64 IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
65 };
66
67 static const u8 ant_toggle_lookup[] = {
68 /*ANT_NONE -> */ ANT_NONE,
69 /*ANT_A -> */ ANT_B,
70 /*ANT_B -> */ ANT_C,
71 /*ANT_AB -> */ ANT_BC,
72 /*ANT_C -> */ ANT_A,
73 /*ANT_AC -> */ ANT_AB,
74 /*ANT_BC -> */ ANT_AC,
75 /*ANT_ABC -> */ ANT_ABC,
76 };
77
78 /**
79 * struct iwl4965_rate_scale_data -- tx success history for one rate
80 */
81 struct iwl4965_rate_scale_data {
82 u64 data; /* bitmap of successful frames */
83 s32 success_counter; /* number of frames successful */
84 s32 success_ratio; /* per-cent * 128 */
85 s32 counter; /* number of frames attempted */
86 s32 average_tpt; /* success ratio * expected throughput */
87 unsigned long stamp;
88 };
89
90 /**
91 * struct iwl4965_scale_tbl_info -- tx params and success history for all rates
92 *
93 * There are two of these in struct iwl4965_lq_sta,
94 * one for "active", and one for "search".
95 */
96 struct iwl4965_scale_tbl_info {
97 enum iwl_table_type lq_type;
98 u8 ant_type;
99 u8 is_SGI; /* 1 = short guard interval */
100 u8 is_fat; /* 1 = 40 MHz channel width */
101 u8 is_dup; /* 1 = duplicated data streams */
102 u8 action; /* change modulation; IWL_[LEGACY/SISO/MIMO]_SWITCH_* */
103 s32 *expected_tpt; /* throughput metrics; expected_tpt_G, etc. */
104 u32 current_rate; /* rate_n_flags, uCode API format */
105 struct iwl4965_rate_scale_data win[IWL_RATE_COUNT]; /* rate histories */
106 };
107
108 struct iwl4965_traffic_load {
109 unsigned long time_stamp; /* age of the oldest statistics */
110 u32 packet_count[TID_QUEUE_MAX_SIZE]; /* packet count in this time
111 * slice */
112 u32 total; /* total num of packets during the
113 * last TID_MAX_TIME_DIFF */
114 u8 queue_count; /* number of queues that has
115 * been used since the last cleanup */
116 u8 head; /* start of the circular buffer */
117 };
118
119 /**
120 * struct iwl4965_lq_sta -- driver's rate scaling private structure
121 *
122 * Pointer to this gets passed back and forth between driver and mac80211.
123 */
124 struct iwl4965_lq_sta {
125 u8 active_tbl; /* index of active table, range 0-1 */
126 u8 enable_counter; /* indicates HT mode */
127 u8 stay_in_tbl; /* 1: disallow, 0: allow search for new mode */
128 u8 search_better_tbl; /* 1: currently trying alternate mode */
129 s32 last_tpt;
130
131 /* The following determine when to search for a new mode */
132 u32 table_count_limit;
133 u32 max_failure_limit; /* # failed frames before new search */
134 u32 max_success_limit; /* # successful frames before new search */
135 u32 table_count;
136 u32 total_failed; /* total failed frames, any/all rates */
137 u32 total_success; /* total successful frames, any/all rates */
138 u32 flush_timer; /* time staying in mode before new search */
139
140 u8 action_counter; /* # mode-switch actions tried */
141 u8 is_green;
142 u8 is_dup;
143 enum ieee80211_band band;
144 u8 ibss_sta_added;
145
146 /* The following are bitmaps of rates; IWL_RATE_6M_MASK, etc. */
147 u32 supp_rates;
148 u16 active_legacy_rate;
149 u16 active_siso_rate;
150 u16 active_mimo2_rate;
151 u16 active_mimo3_rate;
152 u16 active_rate_basic;
153
154 struct iwl_link_quality_cmd lq;
155 struct iwl4965_scale_tbl_info lq_info[LQ_SIZE]; /* "active", "search" */
156 struct iwl4965_traffic_load load[TID_MAX_LOAD_COUNT];
157 u8 tx_agg_tid_en;
158 #ifdef CONFIG_MAC80211_DEBUGFS
159 struct dentry *rs_sta_dbgfs_scale_table_file;
160 struct dentry *rs_sta_dbgfs_stats_table_file;
161 struct dentry *rs_sta_dbgfs_tx_agg_tid_en_file;
162 u32 dbg_fixed_rate;
163 #endif
164 struct iwl_priv *drv;
165 };
166
167 static void rs_rate_scale_perform(struct iwl_priv *priv,
168 struct net_device *dev,
169 struct ieee80211_hdr *hdr,
170 struct sta_info *sta);
171 static void rs_fill_link_cmd(const struct iwl_priv *priv,
172 struct iwl4965_lq_sta *lq_sta,
173 u32 rate_n_flags);
174
175
176 #ifdef CONFIG_MAC80211_DEBUGFS
177 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
178 u32 *rate_n_flags, int index);
179 #else
180 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
181 u32 *rate_n_flags, int index)
182 {}
183 #endif
184
185 /*
186 * Expected throughput metrics for following rates:
187 * 1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
188 * "G" is the only table that supports CCK (the first 4 rates).
189 */
190 /*FIXME:RS:need to spearate tables for MIMO2/MIMO3*/
191 static s32 expected_tpt_A[IWL_RATE_COUNT] = {
192 0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
193 };
194
195 static s32 expected_tpt_G[IWL_RATE_COUNT] = {
196 7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
197 };
198
199 static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
200 0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
201 };
202
203 static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
204 0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
205 };
206
207 static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
208 0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
209 };
210
211 static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
212 0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
213 };
214
215 static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
216 0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
217 };
218
219 static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
220 0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
221 };
222
223 static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
224 0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
225 };
226
227 static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
228 0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
229 };
230
231 static inline u8 rs_extract_rate(u32 rate_n_flags)
232 {
233 return (u8)(rate_n_flags & 0xFF);
234 }
235
236 static void rs_rate_scale_clear_window(struct iwl4965_rate_scale_data *window)
237 {
238 window->data = 0;
239 window->success_counter = 0;
240 window->success_ratio = IWL_INVALID_VALUE;
241 window->counter = 0;
242 window->average_tpt = IWL_INVALID_VALUE;
243 window->stamp = 0;
244 }
245
246 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
247 {
248 return ((ant_type & valid_antenna) == ant_type);
249 }
250
251 /*
252 * removes the old data from the statistics. All data that is older than
253 * TID_MAX_TIME_DIFF, will be deleted.
254 */
255 static void rs_tl_rm_old_stats(struct iwl4965_traffic_load *tl, u32 curr_time)
256 {
257 /* The oldest age we want to keep */
258 u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
259
260 while (tl->queue_count &&
261 (tl->time_stamp < oldest_time)) {
262 tl->total -= tl->packet_count[tl->head];
263 tl->packet_count[tl->head] = 0;
264 tl->time_stamp += TID_QUEUE_CELL_SPACING;
265 tl->queue_count--;
266 tl->head++;
267 if (tl->head >= TID_QUEUE_MAX_SIZE)
268 tl->head = 0;
269 }
270 }
271
272 /*
273 * increment traffic load value for tid and also remove
274 * any old values if passed the certain time period
275 */
276 static u8 rs_tl_add_packet(struct iwl4965_lq_sta *lq_data,
277 struct ieee80211_hdr *hdr)
278 {
279 u32 curr_time = jiffies_to_msecs(jiffies);
280 u32 time_diff;
281 s32 index;
282 struct iwl4965_traffic_load *tl = NULL;
283 u16 fc = le16_to_cpu(hdr->frame_control);
284 u8 tid;
285
286 if (ieee80211_is_qos_data(fc)) {
287 u8 *qc = ieee80211_get_qos_ctrl(hdr, ieee80211_get_hdrlen(fc));
288 tid = qc[0] & 0xf;
289 } else
290 return MAX_TID_COUNT;
291
292 tl = &lq_data->load[tid];
293
294 curr_time -= curr_time % TID_ROUND_VALUE;
295
296 /* Happens only for the first packet. Initialize the data */
297 if (!(tl->queue_count)) {
298 tl->total = 1;
299 tl->time_stamp = curr_time;
300 tl->queue_count = 1;
301 tl->head = 0;
302 tl->packet_count[0] = 1;
303 return MAX_TID_COUNT;
304 }
305
306 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
307 index = time_diff / TID_QUEUE_CELL_SPACING;
308
309 /* The history is too long: remove data that is older than */
310 /* TID_MAX_TIME_DIFF */
311 if (index >= TID_QUEUE_MAX_SIZE)
312 rs_tl_rm_old_stats(tl, curr_time);
313
314 index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
315 tl->packet_count[index] = tl->packet_count[index] + 1;
316 tl->total = tl->total + 1;
317
318 if ((index + 1) > tl->queue_count)
319 tl->queue_count = index + 1;
320
321 return tid;
322 }
323
324 /*
325 get the traffic load value for tid
326 */
327 static u32 rs_tl_get_load(struct iwl4965_lq_sta *lq_data, u8 tid)
328 {
329 u32 curr_time = jiffies_to_msecs(jiffies);
330 u32 time_diff;
331 s32 index;
332 struct iwl4965_traffic_load *tl = NULL;
333
334 if (tid >= TID_MAX_LOAD_COUNT)
335 return 0;
336
337 tl = &(lq_data->load[tid]);
338
339 curr_time -= curr_time % TID_ROUND_VALUE;
340
341 if (!(tl->queue_count))
342 return 0;
343
344 time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
345 index = time_diff / TID_QUEUE_CELL_SPACING;
346
347 /* The history is too long: remove data that is older than */
348 /* TID_MAX_TIME_DIFF */
349 if (index >= TID_QUEUE_MAX_SIZE)
350 rs_tl_rm_old_stats(tl, curr_time);
351
352 return tl->total;
353 }
354
355 static void rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
356 struct iwl4965_lq_sta *lq_data, u8 tid,
357 struct sta_info *sta)
358 {
359 unsigned long state;
360 DECLARE_MAC_BUF(mac);
361
362 spin_lock_bh(&sta->lock);
363 state = sta->ampdu_mlme.tid_state_tx[tid];
364 spin_unlock_bh(&sta->lock);
365
366 if (state == HT_AGG_STATE_IDLE &&
367 rs_tl_get_load(lq_data, tid) > IWL_AGG_LOAD_THRESHOLD) {
368 IWL_DEBUG_HT("Starting Tx agg: STA: %s tid: %d\n",
369 print_mac(mac, sta->addr), tid);
370 ieee80211_start_tx_ba_session(priv->hw, sta->addr, tid);
371 }
372 }
373
374 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
375 struct iwl4965_lq_sta *lq_data,
376 struct sta_info *sta)
377 {
378 if ((tid < TID_MAX_LOAD_COUNT))
379 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
380 else if (tid == IWL_AGG_ALL_TID)
381 for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
382 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
383 }
384
385 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
386 {
387 return (!!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
388 !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
389 !!(rate_n_flags & RATE_MCS_ANT_C_MSK));
390 }
391
392 /**
393 * rs_collect_tx_data - Update the success/failure sliding window
394 *
395 * We keep a sliding window of the last 62 packets transmitted
396 * at this rate. window->data contains the bitmask of successful
397 * packets.
398 */
399 static int rs_collect_tx_data(struct iwl4965_rate_scale_data *windows,
400 int scale_index, s32 tpt, int retries,
401 int successes)
402 {
403 struct iwl4965_rate_scale_data *window = NULL;
404 static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
405 s32 fail_count;
406
407 if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
408 return -EINVAL;
409
410 /* Select data for current tx bit rate */
411 window = &(windows[scale_index]);
412
413 /*
414 * Keep track of only the latest 62 tx frame attempts in this rate's
415 * history window; anything older isn't really relevant any more.
416 * If we have filled up the sliding window, drop the oldest attempt;
417 * if the oldest attempt (highest bit in bitmap) shows "success",
418 * subtract "1" from the success counter (this is the main reason
419 * we keep these bitmaps!).
420 */
421 while (retries > 0) {
422 if (window->counter >= IWL_RATE_MAX_WINDOW) {
423
424 /* remove earliest */
425 window->counter = IWL_RATE_MAX_WINDOW - 1;
426
427 if (window->data & mask) {
428 window->data &= ~mask;
429 window->success_counter--;
430 }
431 }
432
433 /* Increment frames-attempted counter */
434 window->counter++;
435
436 /* Shift bitmap by one frame (throw away oldest history),
437 * OR in "1", and increment "success" if this
438 * frame was successful. */
439 window->data <<= 1;;
440 if (successes > 0) {
441 window->success_counter++;
442 window->data |= 0x1;
443 successes--;
444 }
445
446 retries--;
447 }
448
449 /* Calculate current success ratio, avoid divide-by-0! */
450 if (window->counter > 0)
451 window->success_ratio = 128 * (100 * window->success_counter)
452 / window->counter;
453 else
454 window->success_ratio = IWL_INVALID_VALUE;
455
456 fail_count = window->counter - window->success_counter;
457
458 /* Calculate average throughput, if we have enough history. */
459 if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
460 (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
461 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
462 else
463 window->average_tpt = IWL_INVALID_VALUE;
464
465 /* Tag this window as having been updated */
466 window->stamp = jiffies;
467
468 return 0;
469 }
470
471 /*
472 * Fill uCode API rate_n_flags field, based on "search" or "active" table.
473 */
474 /* FIXME:RS:remove this function and put the flags statically in the table */
475 static u32 rate_n_flags_from_tbl(struct iwl4965_scale_tbl_info *tbl,
476 int index, u8 use_green)
477 {
478 u32 rate_n_flags = 0;
479
480 if (is_legacy(tbl->lq_type)) {
481 rate_n_flags = iwl_rates[index].plcp;
482 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
483 rate_n_flags |= RATE_MCS_CCK_MSK;
484
485 } else if (is_Ht(tbl->lq_type)) {
486 if (index > IWL_LAST_OFDM_RATE) {
487 IWL_ERROR("invalid HT rate index %d\n", index);
488 index = IWL_LAST_OFDM_RATE;
489 }
490 rate_n_flags = RATE_MCS_HT_MSK;
491
492 if (is_siso(tbl->lq_type))
493 rate_n_flags |= iwl_rates[index].plcp_siso;
494 else if (is_mimo2(tbl->lq_type))
495 rate_n_flags |= iwl_rates[index].plcp_mimo2;
496 else
497 rate_n_flags |= iwl_rates[index].plcp_mimo3;
498 } else {
499 IWL_ERROR("Invalid tbl->lq_type %d\n", tbl->lq_type);
500 }
501
502 rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
503 RATE_MCS_ANT_ABC_MSK);
504
505 if (is_Ht(tbl->lq_type)) {
506 if (tbl->is_fat) {
507 if (tbl->is_dup)
508 rate_n_flags |= RATE_MCS_DUP_MSK;
509 else
510 rate_n_flags |= RATE_MCS_FAT_MSK;
511 }
512 if (tbl->is_SGI)
513 rate_n_flags |= RATE_MCS_SGI_MSK;
514
515 if (use_green) {
516 rate_n_flags |= RATE_MCS_GF_MSK;
517 if (is_siso(tbl->lq_type) && tbl->is_SGI) {
518 rate_n_flags &= ~RATE_MCS_SGI_MSK;
519 IWL_ERROR("GF was set with SGI:SISO\n");
520 }
521 }
522 }
523 return rate_n_flags;
524 }
525
526 /*
527 * Interpret uCode API's rate_n_flags format,
528 * fill "search" or "active" tx mode table.
529 */
530 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
531 enum ieee80211_band band,
532 struct iwl4965_scale_tbl_info *tbl,
533 int *rate_idx)
534 {
535 u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
536 u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
537 u8 mcs;
538
539 *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
540
541 if (*rate_idx == IWL_RATE_INVALID) {
542 *rate_idx = -1;
543 return -EINVAL;
544 }
545 tbl->is_SGI = 0; /* default legacy setup */
546 tbl->is_fat = 0;
547 tbl->is_dup = 0;
548 tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
549 tbl->lq_type = LQ_NONE;
550
551 /* legacy rate format */
552 if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
553 if (num_of_ant == 1) {
554 if (band == IEEE80211_BAND_5GHZ)
555 tbl->lq_type = LQ_A;
556 else
557 tbl->lq_type = LQ_G;
558 }
559 /* HT rate format */
560 } else {
561 if (rate_n_flags & RATE_MCS_SGI_MSK)
562 tbl->is_SGI = 1;
563
564 if ((rate_n_flags & RATE_MCS_FAT_MSK) ||
565 (rate_n_flags & RATE_MCS_DUP_MSK))
566 tbl->is_fat = 1;
567
568 if (rate_n_flags & RATE_MCS_DUP_MSK)
569 tbl->is_dup = 1;
570
571 mcs = rs_extract_rate(rate_n_flags);
572
573 /* SISO */
574 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
575 if (num_of_ant == 1)
576 tbl->lq_type = LQ_SISO; /*else NONE*/
577 /* MIMO2 */
578 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
579 if (num_of_ant == 2)
580 tbl->lq_type = LQ_MIMO2;
581 /* MIMO3 */
582 } else {
583 if (num_of_ant == 3)
584 tbl->lq_type = LQ_MIMO3;
585 }
586 }
587 return 0;
588 }
589
590 /* switch to another antenna/antennas and return 1 */
591 /* if no other valid antenna found, return 0 */
592 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
593 struct iwl4965_scale_tbl_info *tbl)
594 {
595 u8 new_ant_type;
596
597 if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
598 return 0;
599
600 if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
601 return 0;
602
603 new_ant_type = ant_toggle_lookup[tbl->ant_type];
604
605 while ((new_ant_type != tbl->ant_type) &&
606 !rs_is_valid_ant(valid_ant, new_ant_type))
607 new_ant_type = ant_toggle_lookup[new_ant_type];
608
609 if (new_ant_type == tbl->ant_type)
610 return 0;
611
612 tbl->ant_type = new_ant_type;
613 *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
614 *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
615 return 1;
616 }
617
618 /* FIXME:RS: in 4965 we don't use greenfield at all */
619 /* FIXME:RS: don't use greenfield for now in TX */
620 #if 0
621 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
622 {
623 return ((conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) &&
624 priv->current_ht_config.is_green_field &&
625 !priv->current_ht_config.non_GF_STA_present);
626 }
627 #endif
628 static inline u8 rs_use_green(struct iwl_priv *priv, struct ieee80211_conf *conf)
629 {
630 return 0;
631 }
632
633 /**
634 * rs_get_supported_rates - get the available rates
635 *
636 * if management frame or broadcast frame only return
637 * basic available rates.
638 *
639 */
640 static u16 rs_get_supported_rates(struct iwl4965_lq_sta *lq_sta,
641 struct ieee80211_hdr *hdr,
642 enum iwl_table_type rate_type)
643 {
644 if (hdr && is_multicast_ether_addr(hdr->addr1) &&
645 lq_sta->active_rate_basic)
646 return lq_sta->active_rate_basic;
647
648 if (is_legacy(rate_type)) {
649 return lq_sta->active_legacy_rate;
650 } else {
651 if (is_siso(rate_type))
652 return lq_sta->active_siso_rate;
653 else if (is_mimo2(rate_type))
654 return lq_sta->active_mimo2_rate;
655 else
656 return lq_sta->active_mimo3_rate;
657 }
658 }
659
660 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
661 int rate_type)
662 {
663 u8 high = IWL_RATE_INVALID;
664 u8 low = IWL_RATE_INVALID;
665
666 /* 802.11A or ht walks to the next literal adjacent rate in
667 * the rate table */
668 if (is_a_band(rate_type) || !is_legacy(rate_type)) {
669 int i;
670 u32 mask;
671
672 /* Find the previous rate that is in the rate mask */
673 i = index - 1;
674 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
675 if (rate_mask & mask) {
676 low = i;
677 break;
678 }
679 }
680
681 /* Find the next rate that is in the rate mask */
682 i = index + 1;
683 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
684 if (rate_mask & mask) {
685 high = i;
686 break;
687 }
688 }
689
690 return (high << 8) | low;
691 }
692
693 low = index;
694 while (low != IWL_RATE_INVALID) {
695 low = iwl_rates[low].prev_rs;
696 if (low == IWL_RATE_INVALID)
697 break;
698 if (rate_mask & (1 << low))
699 break;
700 IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
701 }
702
703 high = index;
704 while (high != IWL_RATE_INVALID) {
705 high = iwl_rates[high].next_rs;
706 if (high == IWL_RATE_INVALID)
707 break;
708 if (rate_mask & (1 << high))
709 break;
710 IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
711 }
712
713 return (high << 8) | low;
714 }
715
716 static u32 rs_get_lower_rate(struct iwl4965_lq_sta *lq_sta,
717 struct iwl4965_scale_tbl_info *tbl, u8 scale_index,
718 u8 ht_possible)
719 {
720 s32 low;
721 u16 rate_mask;
722 u16 high_low;
723 u8 switch_to_legacy = 0;
724 u8 is_green = lq_sta->is_green;
725
726 /* check if we need to switch from HT to legacy rates.
727 * assumption is that mandatory rates (1Mbps or 6Mbps)
728 * are always supported (spec demand) */
729 if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
730 switch_to_legacy = 1;
731 scale_index = rs_ht_to_legacy[scale_index];
732 if (lq_sta->band == IEEE80211_BAND_5GHZ)
733 tbl->lq_type = LQ_A;
734 else
735 tbl->lq_type = LQ_G;
736
737 if (num_of_ant(tbl->ant_type) > 1)
738 tbl->ant_type = ANT_A;/*FIXME:RS*/
739
740 tbl->is_fat = 0;
741 tbl->is_SGI = 0;
742 }
743
744 rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
745
746 /* Mask with station rate restriction */
747 if (is_legacy(tbl->lq_type)) {
748 /* supp_rates has no CCK bits in A mode */
749 if (lq_sta->band == IEEE80211_BAND_5GHZ)
750 rate_mask = (u16)(rate_mask &
751 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
752 else
753 rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
754 }
755
756 /* If we switched from HT to legacy, check current rate */
757 if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
758 low = scale_index;
759 goto out;
760 }
761
762 high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
763 tbl->lq_type);
764 low = high_low & 0xff;
765
766 if (low == IWL_RATE_INVALID)
767 low = scale_index;
768
769 out:
770 return rate_n_flags_from_tbl(tbl, low, is_green);
771 }
772
773 /*
774 * mac80211 sends us Tx status
775 */
776 static void rs_tx_status(void *priv_rate, struct net_device *dev,
777 struct sk_buff *skb)
778 {
779 int status;
780 u8 retries;
781 int rs_index, index = 0;
782 struct iwl4965_lq_sta *lq_sta;
783 struct iwl_link_quality_cmd *table;
784 struct sta_info *sta;
785 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
786 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
787 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
788 struct ieee80211_hw *hw = local_to_hw(local);
789 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
790 struct iwl4965_rate_scale_data *window = NULL;
791 struct iwl4965_rate_scale_data *search_win = NULL;
792 u32 tx_rate;
793 struct iwl4965_scale_tbl_info tbl_type;
794 struct iwl4965_scale_tbl_info *curr_tbl, *search_tbl;
795 u8 active_index = 0;
796 u16 fc = le16_to_cpu(hdr->frame_control);
797 s32 tpt = 0;
798
799 IWL_DEBUG_RATE_LIMIT("get frame ack response, update rate scale window\n");
800
801 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
802 return;
803
804 /* This packet was aggregated but doesn't carry rate scale info */
805 if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
806 !(info->flags & IEEE80211_TX_STAT_AMPDU))
807 return;
808
809 retries = info->status.retry_count;
810
811 if (retries > 15)
812 retries = 15;
813
814 rcu_read_lock();
815
816 sta = sta_info_get(local, hdr->addr1);
817
818 if (!sta || !sta->rate_ctrl_priv)
819 goto out;
820
821
822 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
823
824 if (!priv->lq_mngr.lq_ready)
825 goto out;
826
827 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
828 !lq_sta->ibss_sta_added)
829 goto out;
830
831 table = &lq_sta->lq;
832 active_index = lq_sta->active_tbl;
833
834 curr_tbl = &(lq_sta->lq_info[active_index]);
835 search_tbl = &(lq_sta->lq_info[(1 - active_index)]);
836 window = (struct iwl4965_rate_scale_data *)
837 &(curr_tbl->win[0]);
838 search_win = (struct iwl4965_rate_scale_data *)
839 &(search_tbl->win[0]);
840
841 /*
842 * Ignore this Tx frame response if its initial rate doesn't match
843 * that of latest Link Quality command. There may be stragglers
844 * from a previous Link Quality command, but we're no longer interested
845 * in those; they're either from the "active" mode while we're trying
846 * to check "search" mode, or a prior "search" mode after we've moved
847 * to a new "search" mode (which might become the new "active" mode).
848 */
849 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
850 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
851 if (priv->band == IEEE80211_BAND_5GHZ)
852 rs_index -= IWL_FIRST_OFDM_RATE;
853
854 if ((info->tx_rate_idx < 0) ||
855 (tbl_type.is_SGI ^
856 !!(info->flags & IEEE80211_TX_CTL_SHORT_GI)) ||
857 (tbl_type.is_fat ^
858 !!(info->flags & IEEE80211_TX_CTL_40_MHZ_WIDTH)) ||
859 (tbl_type.is_dup ^
860 !!(info->flags & IEEE80211_TX_CTL_DUP_DATA)) ||
861 (tbl_type.ant_type ^ info->antenna_sel_tx) ||
862 (!!(tx_rate & RATE_MCS_HT_MSK) ^
863 !!(info->flags & IEEE80211_TX_CTL_OFDM_HT)) ||
864 (!!(tx_rate & RATE_MCS_GF_MSK) ^
865 !!(info->flags & IEEE80211_TX_CTL_GREEN_FIELD)) ||
866 (hw->wiphy->bands[priv->band]->bitrates[rs_index].bitrate !=
867 hw->wiphy->bands[info->band]->bitrates[info->tx_rate_idx].bitrate)) {
868 IWL_DEBUG_RATE("initial rate does not match 0x%x\n", tx_rate);
869 goto out;
870 }
871
872 /* Update frame history window with "failure" for each Tx retry. */
873 while (retries) {
874 /* Look up the rate and other info used for each tx attempt.
875 * Each tx attempt steps one entry deeper in the rate table. */
876 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
877 rs_get_tbl_info_from_mcs(tx_rate, priv->band,
878 &tbl_type, &rs_index);
879
880 /* If type matches "search" table,
881 * add failure to "search" history */
882 if ((tbl_type.lq_type == search_tbl->lq_type) &&
883 (tbl_type.ant_type == search_tbl->ant_type) &&
884 (tbl_type.is_SGI == search_tbl->is_SGI)) {
885 if (search_tbl->expected_tpt)
886 tpt = search_tbl->expected_tpt[rs_index];
887 else
888 tpt = 0;
889 rs_collect_tx_data(search_win, rs_index, tpt, 1, 0);
890
891 /* Else if type matches "current/active" table,
892 * add failure to "current/active" history */
893 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
894 (tbl_type.ant_type == curr_tbl->ant_type) &&
895 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
896 if (curr_tbl->expected_tpt)
897 tpt = curr_tbl->expected_tpt[rs_index];
898 else
899 tpt = 0;
900 rs_collect_tx_data(window, rs_index, tpt, 1, 0);
901 }
902
903 /* If not searching for a new mode, increment failed counter
904 * ... this helps determine when to start searching again */
905 if (lq_sta->stay_in_tbl)
906 lq_sta->total_failed++;
907 --retries;
908 index++;
909
910 }
911
912 /*
913 * Find (by rate) the history window to update with final Tx attempt;
914 * if Tx was successful first try, use original rate,
915 * else look up the rate that was, finally, successful.
916 */
917 tx_rate = le32_to_cpu(table->rs_table[index].rate_n_flags);
918 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
919
920 /* Update frame history window with "success" if Tx got ACKed ... */
921 status = !!(info->flags & IEEE80211_TX_STAT_ACK);
922
923 /* If type matches "search" table,
924 * add final tx status to "search" history */
925 if ((tbl_type.lq_type == search_tbl->lq_type) &&
926 (tbl_type.ant_type == search_tbl->ant_type) &&
927 (tbl_type.is_SGI == search_tbl->is_SGI)) {
928 if (search_tbl->expected_tpt)
929 tpt = search_tbl->expected_tpt[rs_index];
930 else
931 tpt = 0;
932 if (info->flags & IEEE80211_TX_CTL_AMPDU)
933 rs_collect_tx_data(search_win, rs_index, tpt,
934 info->status.ampdu_ack_len,
935 info->status.ampdu_ack_map);
936 else
937 rs_collect_tx_data(search_win, rs_index, tpt,
938 1, status);
939 /* Else if type matches "current/active" table,
940 * add final tx status to "current/active" history */
941 } else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
942 (tbl_type.ant_type == curr_tbl->ant_type) &&
943 (tbl_type.is_SGI == curr_tbl->is_SGI)) {
944 if (curr_tbl->expected_tpt)
945 tpt = curr_tbl->expected_tpt[rs_index];
946 else
947 tpt = 0;
948 if (info->flags & IEEE80211_TX_CTL_AMPDU)
949 rs_collect_tx_data(window, rs_index, tpt,
950 info->status.ampdu_ack_len,
951 info->status.ampdu_ack_map);
952 else
953 rs_collect_tx_data(window, rs_index, tpt,
954 1, status);
955 }
956
957 /* If not searching for new mode, increment success/failed counter
958 * ... these help determine when to start searching again */
959 if (lq_sta->stay_in_tbl) {
960 if (info->flags & IEEE80211_TX_CTL_AMPDU) {
961 lq_sta->total_success += info->status.ampdu_ack_map;
962 lq_sta->total_failed +=
963 (info->status.ampdu_ack_len - info->status.ampdu_ack_map);
964 } else {
965 if (status)
966 lq_sta->total_success++;
967 else
968 lq_sta->total_failed++;
969 }
970 }
971
972 /* See if there's a better rate or modulation mode to try. */
973 rs_rate_scale_perform(priv, dev, hdr, sta);
974 out:
975 rcu_read_unlock();
976 return;
977 }
978
979 /*
980 * Begin a period of staying with a selected modulation mode.
981 * Set "stay_in_tbl" flag to prevent any mode switches.
982 * Set frame tx success limits according to legacy vs. high-throughput,
983 * and reset overall (spanning all rates) tx success history statistics.
984 * These control how long we stay using same modulation mode before
985 * searching for a new mode.
986 */
987 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
988 struct iwl4965_lq_sta *lq_sta)
989 {
990 IWL_DEBUG_RATE("we are staying in the same table\n");
991 lq_sta->stay_in_tbl = 1; /* only place this gets set */
992 if (is_legacy) {
993 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
994 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
995 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
996 } else {
997 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
998 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
999 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1000 }
1001 lq_sta->table_count = 0;
1002 lq_sta->total_failed = 0;
1003 lq_sta->total_success = 0;
1004 }
1005
1006 /*
1007 * Find correct throughput table for given mode of modulation
1008 */
1009 static void rs_set_expected_tpt_table(struct iwl4965_lq_sta *lq_sta,
1010 struct iwl4965_scale_tbl_info *tbl)
1011 {
1012 if (is_legacy(tbl->lq_type)) {
1013 if (!is_a_band(tbl->lq_type))
1014 tbl->expected_tpt = expected_tpt_G;
1015 else
1016 tbl->expected_tpt = expected_tpt_A;
1017 } else if (is_siso(tbl->lq_type)) {
1018 if (tbl->is_fat && !lq_sta->is_dup)
1019 if (tbl->is_SGI)
1020 tbl->expected_tpt = expected_tpt_siso40MHzSGI;
1021 else
1022 tbl->expected_tpt = expected_tpt_siso40MHz;
1023 else if (tbl->is_SGI)
1024 tbl->expected_tpt = expected_tpt_siso20MHzSGI;
1025 else
1026 tbl->expected_tpt = expected_tpt_siso20MHz;
1027
1028 } else if (is_mimo(tbl->lq_type)) { /* FIXME:need to separate mimo2/3 */
1029 if (tbl->is_fat && !lq_sta->is_dup)
1030 if (tbl->is_SGI)
1031 tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
1032 else
1033 tbl->expected_tpt = expected_tpt_mimo40MHz;
1034 else if (tbl->is_SGI)
1035 tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
1036 else
1037 tbl->expected_tpt = expected_tpt_mimo20MHz;
1038 } else
1039 tbl->expected_tpt = expected_tpt_G;
1040 }
1041
1042 /*
1043 * Find starting rate for new "search" high-throughput mode of modulation.
1044 * Goal is to find lowest expected rate (under perfect conditions) that is
1045 * above the current measured throughput of "active" mode, to give new mode
1046 * a fair chance to prove itself without too many challenges.
1047 *
1048 * This gets called when transitioning to more aggressive modulation
1049 * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1050 * (i.e. MIMO to SISO). When moving to MIMO, bit rate will typically need
1051 * to decrease to match "active" throughput. When moving from MIMO to SISO,
1052 * bit rate will typically need to increase, but not if performance was bad.
1053 */
1054 static s32 rs_get_best_rate(struct iwl_priv *priv,
1055 struct iwl4965_lq_sta *lq_sta,
1056 struct iwl4965_scale_tbl_info *tbl, /* "search" */
1057 u16 rate_mask, s8 index)
1058 {
1059 /* "active" values */
1060 struct iwl4965_scale_tbl_info *active_tbl =
1061 &(lq_sta->lq_info[lq_sta->active_tbl]);
1062 s32 active_sr = active_tbl->win[index].success_ratio;
1063 s32 active_tpt = active_tbl->expected_tpt[index];
1064
1065 /* expected "search" throughput */
1066 s32 *tpt_tbl = tbl->expected_tpt;
1067
1068 s32 new_rate, high, low, start_hi;
1069 u16 high_low;
1070 s8 rate = index;
1071
1072 new_rate = high = low = start_hi = IWL_RATE_INVALID;
1073
1074 for (; ;) {
1075 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1076 tbl->lq_type);
1077
1078 low = high_low & 0xff;
1079 high = (high_low >> 8) & 0xff;
1080
1081 /*
1082 * Lower the "search" bit rate, to give new "search" mode
1083 * approximately the same throughput as "active" if:
1084 *
1085 * 1) "Active" mode has been working modestly well (but not
1086 * great), and expected "search" throughput (under perfect
1087 * conditions) at candidate rate is above the actual
1088 * measured "active" throughput (but less than expected
1089 * "active" throughput under perfect conditions).
1090 * OR
1091 * 2) "Active" mode has been working perfectly or very well
1092 * and expected "search" throughput (under perfect
1093 * conditions) at candidate rate is above expected
1094 * "active" throughput (under perfect conditions).
1095 */
1096 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1097 ((active_sr > IWL_RATE_DECREASE_TH) &&
1098 (active_sr <= IWL_RATE_HIGH_TH) &&
1099 (tpt_tbl[rate] <= active_tpt))) ||
1100 ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1101 (tpt_tbl[rate] > active_tpt))) {
1102
1103 /* (2nd or later pass)
1104 * If we've already tried to raise the rate, and are
1105 * now trying to lower it, use the higher rate. */
1106 if (start_hi != IWL_RATE_INVALID) {
1107 new_rate = start_hi;
1108 break;
1109 }
1110
1111 new_rate = rate;
1112
1113 /* Loop again with lower rate */
1114 if (low != IWL_RATE_INVALID)
1115 rate = low;
1116
1117 /* Lower rate not available, use the original */
1118 else
1119 break;
1120
1121 /* Else try to raise the "search" rate to match "active" */
1122 } else {
1123 /* (2nd or later pass)
1124 * If we've already tried to lower the rate, and are
1125 * now trying to raise it, use the lower rate. */
1126 if (new_rate != IWL_RATE_INVALID)
1127 break;
1128
1129 /* Loop again with higher rate */
1130 else if (high != IWL_RATE_INVALID) {
1131 start_hi = high;
1132 rate = high;
1133
1134 /* Higher rate not available, use the original */
1135 } else {
1136 break;
1137 }
1138 }
1139 }
1140
1141 return new_rate;
1142 }
1143
1144 /*
1145 * Set up search table for MIMO
1146 */
1147 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1148 struct iwl4965_lq_sta *lq_sta,
1149 struct ieee80211_conf *conf,
1150 struct sta_info *sta,
1151 struct iwl4965_scale_tbl_info *tbl, int index)
1152 {
1153 u16 rate_mask;
1154 s32 rate;
1155 s8 is_green = lq_sta->is_green;
1156
1157 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1158 !sta->ht_info.ht_supported)
1159 return -1;
1160
1161 if (priv->current_ht_config.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
1162 return -1;
1163
1164 /* Need both Tx chains/antennas to support MIMO */
1165 if (priv->hw_params.tx_chains_num < 2)
1166 return -1;
1167
1168 IWL_DEBUG_RATE("LQ: try to switch to MIMO2\n");
1169
1170 tbl->lq_type = LQ_MIMO2;
1171 tbl->is_dup = lq_sta->is_dup;
1172 tbl->action = 0;
1173 rate_mask = lq_sta->active_mimo2_rate;
1174
1175 if (priv->current_ht_config.supported_chan_width
1176 == IWL_CHANNEL_WIDTH_40MHZ)
1177 tbl->is_fat = 1;
1178 else
1179 tbl->is_fat = 0;
1180
1181 /* FIXME: - don't toggle SGI here
1182 if (tbl->is_fat) {
1183 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1184 tbl->is_SGI = 1;
1185 else
1186 tbl->is_SGI = 0;
1187 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1188 tbl->is_SGI = 1;
1189 else
1190 tbl->is_SGI = 0;
1191 */
1192
1193 rs_set_expected_tpt_table(lq_sta, tbl);
1194
1195 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1196
1197 IWL_DEBUG_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1198
1199 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1200 IWL_DEBUG_RATE("Can't switch with index %d rate mask %x\n",
1201 rate, rate_mask);
1202 return -1;
1203 }
1204 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1205
1206 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1207 tbl->current_rate, is_green);
1208 return 0;
1209 }
1210
1211 /*
1212 * Set up search table for SISO
1213 */
1214 static int rs_switch_to_siso(struct iwl_priv *priv,
1215 struct iwl4965_lq_sta *lq_sta,
1216 struct ieee80211_conf *conf,
1217 struct sta_info *sta,
1218 struct iwl4965_scale_tbl_info *tbl, int index)
1219 {
1220 u16 rate_mask;
1221 u8 is_green = lq_sta->is_green;
1222 s32 rate;
1223
1224 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) ||
1225 !sta->ht_info.ht_supported)
1226 return -1;
1227
1228 IWL_DEBUG_RATE("LQ: try to switch to SISO\n");
1229
1230 tbl->is_dup = lq_sta->is_dup;
1231 tbl->lq_type = LQ_SISO;
1232 tbl->action = 0;
1233 rate_mask = lq_sta->active_siso_rate;
1234
1235 if (priv->current_ht_config.supported_chan_width
1236 == IWL_CHANNEL_WIDTH_40MHZ)
1237 tbl->is_fat = 1;
1238 else
1239 tbl->is_fat = 0;
1240
1241 /* FIXME: - don't toggle SGI here
1242 if (tbl->is_fat) {
1243 if (priv->current_ht_config.sgf & HT_SHORT_GI_40MHZ_ONLY)
1244 tbl->is_SGI = 1;
1245 else
1246 tbl->is_SGI = 0;
1247 } else if (priv->current_ht_config.sgf & HT_SHORT_GI_20MHZ_ONLY)
1248 tbl->is_SGI = 1;
1249 else
1250 tbl->is_SGI = 0;
1251 */
1252
1253 if (is_green)
1254 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1255
1256 rs_set_expected_tpt_table(lq_sta, tbl);
1257 rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1258
1259 IWL_DEBUG_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
1260 if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1261 IWL_DEBUG_RATE("can not switch with index %d rate mask %x\n",
1262 rate, rate_mask);
1263 return -1;
1264 }
1265 tbl->current_rate = rate_n_flags_from_tbl(tbl, rate, is_green);
1266 IWL_DEBUG_RATE("LQ: Switch to new mcs %X index is green %X\n",
1267 tbl->current_rate, is_green);
1268 return 0;
1269 }
1270
1271 /*
1272 * Try to switch to new modulation mode from legacy
1273 */
1274 static int rs_move_legacy_other(struct iwl_priv *priv,
1275 struct iwl4965_lq_sta *lq_sta,
1276 struct ieee80211_conf *conf,
1277 struct sta_info *sta,
1278 int index)
1279 {
1280 struct iwl4965_scale_tbl_info *tbl =
1281 &(lq_sta->lq_info[lq_sta->active_tbl]);
1282 struct iwl4965_scale_tbl_info *search_tbl =
1283 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1284 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1285 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1286 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1287 u8 start_action = tbl->action;
1288 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1289 int ret = 0;
1290
1291 for (; ;) {
1292 switch (tbl->action) {
1293 case IWL_LEGACY_SWITCH_ANTENNA:
1294 IWL_DEBUG_RATE("LQ: Legacy toggle Antenna\n");
1295
1296 lq_sta->action_counter++;
1297
1298 /* Don't change antenna if success has been great */
1299 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1300 break;
1301
1302 /* Set up search table to try other antenna */
1303 memcpy(search_tbl, tbl, sz);
1304
1305 if (rs_toggle_antenna(valid_tx_ant,
1306 &search_tbl->current_rate, search_tbl)) {
1307 lq_sta->search_better_tbl = 1;
1308 goto out;
1309 }
1310 break;
1311 case IWL_LEGACY_SWITCH_SISO:
1312 IWL_DEBUG_RATE("LQ: Legacy switch to SISO\n");
1313
1314 /* Set up search table to try SISO */
1315 memcpy(search_tbl, tbl, sz);
1316 search_tbl->is_SGI = 0;
1317 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1318 search_tbl, index);
1319 if (!ret) {
1320 lq_sta->search_better_tbl = 1;
1321 lq_sta->action_counter = 0;
1322 goto out;
1323 }
1324
1325 break;
1326 case IWL_LEGACY_SWITCH_MIMO2:
1327 IWL_DEBUG_RATE("LQ: Legacy switch to MIMO2\n");
1328
1329 /* Set up search table to try MIMO */
1330 memcpy(search_tbl, tbl, sz);
1331 search_tbl->is_SGI = 0;
1332 search_tbl->ant_type = ANT_AB;/*FIXME:RS*/
1333 /*FIXME:RS:need to check ant validity*/
1334 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1335 search_tbl, index);
1336 if (!ret) {
1337 lq_sta->search_better_tbl = 1;
1338 lq_sta->action_counter = 0;
1339 goto out;
1340 }
1341 break;
1342 }
1343 tbl->action++;
1344 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1345 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1346
1347 if (tbl->action == start_action)
1348 break;
1349
1350 }
1351 return 0;
1352
1353 out:
1354 tbl->action++;
1355 if (tbl->action > IWL_LEGACY_SWITCH_MIMO2)
1356 tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
1357 return 0;
1358
1359 }
1360
1361 /*
1362 * Try to switch to new modulation mode from SISO
1363 */
1364 static int rs_move_siso_to_other(struct iwl_priv *priv,
1365 struct iwl4965_lq_sta *lq_sta,
1366 struct ieee80211_conf *conf,
1367 struct sta_info *sta,
1368 int index)
1369 {
1370 u8 is_green = lq_sta->is_green;
1371 struct iwl4965_scale_tbl_info *tbl =
1372 &(lq_sta->lq_info[lq_sta->active_tbl]);
1373 struct iwl4965_scale_tbl_info *search_tbl =
1374 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1375 struct iwl4965_rate_scale_data *window = &(tbl->win[index]);
1376 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1377 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1378 u8 start_action = tbl->action;
1379 u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1380 int ret;
1381
1382 for (;;) {
1383 lq_sta->action_counter++;
1384 switch (tbl->action) {
1385 case IWL_SISO_SWITCH_ANTENNA:
1386 IWL_DEBUG_RATE("LQ: SISO toggle Antenna\n");
1387 if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1388 break;
1389
1390 memcpy(search_tbl, tbl, sz);
1391 if (rs_toggle_antenna(valid_tx_ant,
1392 &search_tbl->current_rate, search_tbl)) {
1393 lq_sta->search_better_tbl = 1;
1394 goto out;
1395 }
1396 break;
1397 case IWL_SISO_SWITCH_MIMO2:
1398 IWL_DEBUG_RATE("LQ: SISO switch to MIMO2\n");
1399 memcpy(search_tbl, tbl, sz);
1400 search_tbl->is_SGI = 0;
1401 search_tbl->ant_type = ANT_AB; /*FIXME:RS*/
1402 ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1403 search_tbl, index);
1404 if (!ret) {
1405 lq_sta->search_better_tbl = 1;
1406 goto out;
1407 }
1408 break;
1409 case IWL_SISO_SWITCH_GI:
1410 if (!tbl->is_fat &&
1411 !(priv->current_ht_config.sgf &
1412 HT_SHORT_GI_20MHZ))
1413 break;
1414 if (tbl->is_fat &&
1415 !(priv->current_ht_config.sgf &
1416 HT_SHORT_GI_40MHZ))
1417 break;
1418
1419 IWL_DEBUG_RATE("LQ: SISO toggle SGI/NGI\n");
1420
1421 memcpy(search_tbl, tbl, sz);
1422 if (is_green) {
1423 if (!tbl->is_SGI)
1424 break;
1425 else
1426 IWL_ERROR("SGI was set in GF+SISO\n");
1427 }
1428 search_tbl->is_SGI = !tbl->is_SGI;
1429 rs_set_expected_tpt_table(lq_sta, search_tbl);
1430 if (tbl->is_SGI) {
1431 s32 tpt = lq_sta->last_tpt / 100;
1432 if (tpt >= search_tbl->expected_tpt[index])
1433 break;
1434 }
1435 search_tbl->current_rate = rate_n_flags_from_tbl(
1436 search_tbl, index, is_green);
1437 lq_sta->search_better_tbl = 1;
1438 goto out;
1439 }
1440 tbl->action++;
1441 if (tbl->action > IWL_SISO_SWITCH_GI)
1442 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1443
1444 if (tbl->action == start_action)
1445 break;
1446 }
1447 return 0;
1448
1449 out:
1450 tbl->action++;
1451 if (tbl->action > IWL_SISO_SWITCH_GI)
1452 tbl->action = IWL_SISO_SWITCH_ANTENNA;
1453 return 0;
1454 }
1455
1456 /*
1457 * Try to switch to new modulation mode from MIMO
1458 */
1459 static int rs_move_mimo_to_other(struct iwl_priv *priv,
1460 struct iwl4965_lq_sta *lq_sta,
1461 struct ieee80211_conf *conf,
1462 struct sta_info *sta,
1463 int index)
1464 {
1465 s8 is_green = lq_sta->is_green;
1466 struct iwl4965_scale_tbl_info *tbl =
1467 &(lq_sta->lq_info[lq_sta->active_tbl]);
1468 struct iwl4965_scale_tbl_info *search_tbl =
1469 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1470 u32 sz = (sizeof(struct iwl4965_scale_tbl_info) -
1471 (sizeof(struct iwl4965_rate_scale_data) * IWL_RATE_COUNT));
1472 u8 start_action = tbl->action;
1473 /*u8 valid_tx_ant = priv->hw_params.valid_tx_ant;*/
1474 int ret;
1475
1476 for (;;) {
1477 lq_sta->action_counter++;
1478 switch (tbl->action) {
1479 case IWL_MIMO_SWITCH_ANTENNA_A:
1480 case IWL_MIMO_SWITCH_ANTENNA_B:
1481 IWL_DEBUG_RATE("LQ: MIMO2 switch to SISO\n");
1482
1483 /* Set up new search table for SISO */
1484 memcpy(search_tbl, tbl, sz);
1485
1486 /*FIXME:RS:need to check ant validity + C*/
1487 if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
1488 search_tbl->ant_type = ANT_A;
1489 else
1490 search_tbl->ant_type = ANT_B;
1491
1492 ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1493 search_tbl, index);
1494 if (!ret) {
1495 lq_sta->search_better_tbl = 1;
1496 goto out;
1497 }
1498 break;
1499
1500 case IWL_MIMO_SWITCH_GI:
1501 if (!tbl->is_fat &&
1502 !(priv->current_ht_config.sgf &
1503 HT_SHORT_GI_20MHZ))
1504 break;
1505 if (tbl->is_fat &&
1506 !(priv->current_ht_config.sgf &
1507 HT_SHORT_GI_40MHZ))
1508 break;
1509
1510 IWL_DEBUG_RATE("LQ: MIMO toggle SGI/NGI\n");
1511
1512 /* Set up new search table for MIMO */
1513 memcpy(search_tbl, tbl, sz);
1514 search_tbl->is_SGI = !tbl->is_SGI;
1515 rs_set_expected_tpt_table(lq_sta, search_tbl);
1516 /*
1517 * If active table already uses the fastest possible
1518 * modulation (dual stream with short guard interval),
1519 * and it's working well, there's no need to look
1520 * for a better type of modulation!
1521 */
1522 if (tbl->is_SGI) {
1523 s32 tpt = lq_sta->last_tpt / 100;
1524 if (tpt >= search_tbl->expected_tpt[index])
1525 break;
1526 }
1527 search_tbl->current_rate = rate_n_flags_from_tbl(
1528 search_tbl, index, is_green);
1529 lq_sta->search_better_tbl = 1;
1530 goto out;
1531
1532 }
1533 tbl->action++;
1534 if (tbl->action > IWL_MIMO_SWITCH_GI)
1535 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1536
1537 if (tbl->action == start_action)
1538 break;
1539 }
1540
1541 return 0;
1542 out:
1543 tbl->action++;
1544 if (tbl->action > IWL_MIMO_SWITCH_GI)
1545 tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
1546 return 0;
1547
1548 }
1549
1550 /*
1551 * Check whether we should continue using same modulation mode, or
1552 * begin search for a new mode, based on:
1553 * 1) # tx successes or failures while using this mode
1554 * 2) # times calling this function
1555 * 3) elapsed time in this mode (not used, for now)
1556 */
1557 static void rs_stay_in_table(struct iwl4965_lq_sta *lq_sta)
1558 {
1559 struct iwl4965_scale_tbl_info *tbl;
1560 int i;
1561 int active_tbl;
1562 int flush_interval_passed = 0;
1563 struct iwl_priv *priv;
1564
1565 priv = lq_sta->drv;
1566 active_tbl = lq_sta->active_tbl;
1567
1568 tbl = &(lq_sta->lq_info[active_tbl]);
1569
1570 /* If we've been disallowing search, see if we should now allow it */
1571 if (lq_sta->stay_in_tbl) {
1572
1573 /* Elapsed time using current modulation mode */
1574 if (lq_sta->flush_timer)
1575 flush_interval_passed =
1576 time_after(jiffies,
1577 (unsigned long)(lq_sta->flush_timer +
1578 IWL_RATE_SCALE_FLUSH_INTVL));
1579
1580 /*
1581 * Check if we should allow search for new modulation mode.
1582 * If many frames have failed or succeeded, or we've used
1583 * this same modulation for a long time, allow search, and
1584 * reset history stats that keep track of whether we should
1585 * allow a new search. Also (below) reset all bitmaps and
1586 * stats in active history.
1587 */
1588 if ((lq_sta->total_failed > lq_sta->max_failure_limit) ||
1589 (lq_sta->total_success > lq_sta->max_success_limit) ||
1590 ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
1591 && (flush_interval_passed))) {
1592 IWL_DEBUG_RATE("LQ: stay is expired %d %d %d\n:",
1593 lq_sta->total_failed,
1594 lq_sta->total_success,
1595 flush_interval_passed);
1596
1597 /* Allow search for new mode */
1598 lq_sta->stay_in_tbl = 0; /* only place reset */
1599 lq_sta->total_failed = 0;
1600 lq_sta->total_success = 0;
1601 lq_sta->flush_timer = 0;
1602
1603 /*
1604 * Else if we've used this modulation mode enough repetitions
1605 * (regardless of elapsed time or success/failure), reset
1606 * history bitmaps and rate-specific stats for all rates in
1607 * active table.
1608 */
1609 } else {
1610 lq_sta->table_count++;
1611 if (lq_sta->table_count >=
1612 lq_sta->table_count_limit) {
1613 lq_sta->table_count = 0;
1614
1615 IWL_DEBUG_RATE("LQ: stay in table clear win\n");
1616 for (i = 0; i < IWL_RATE_COUNT; i++)
1617 rs_rate_scale_clear_window(
1618 &(tbl->win[i]));
1619 }
1620 }
1621
1622 /* If transitioning to allow "search", reset all history
1623 * bitmaps and stats in active table (this will become the new
1624 * "search" table). */
1625 if (!lq_sta->stay_in_tbl) {
1626 for (i = 0; i < IWL_RATE_COUNT; i++)
1627 rs_rate_scale_clear_window(&(tbl->win[i]));
1628 }
1629 }
1630 }
1631
1632 /*
1633 * Do rate scaling and search for new modulation mode.
1634 */
1635 static void rs_rate_scale_perform(struct iwl_priv *priv,
1636 struct net_device *dev,
1637 struct ieee80211_hdr *hdr,
1638 struct sta_info *sta)
1639 {
1640 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1641 struct ieee80211_hw *hw = local_to_hw(local);
1642 struct ieee80211_conf *conf = &hw->conf;
1643 int low = IWL_RATE_INVALID;
1644 int high = IWL_RATE_INVALID;
1645 int index;
1646 int i;
1647 struct iwl4965_rate_scale_data *window = NULL;
1648 int current_tpt = IWL_INVALID_VALUE;
1649 int low_tpt = IWL_INVALID_VALUE;
1650 int high_tpt = IWL_INVALID_VALUE;
1651 u32 fail_count;
1652 s8 scale_action = 0;
1653 u16 fc, rate_mask;
1654 u8 update_lq = 0;
1655 struct iwl4965_lq_sta *lq_sta;
1656 struct iwl4965_scale_tbl_info *tbl, *tbl1;
1657 u16 rate_scale_index_msk = 0;
1658 u32 rate;
1659 u8 is_green = 0;
1660 u8 active_tbl = 0;
1661 u8 done_search = 0;
1662 u16 high_low;
1663 s32 sr;
1664 u8 tid = MAX_TID_COUNT;
1665
1666 IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
1667
1668 fc = le16_to_cpu(hdr->frame_control);
1669 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
1670 /* Send management frames and broadcast/multicast data using
1671 * lowest rate. */
1672 /* TODO: this could probably be improved.. */
1673 return;
1674 }
1675
1676 if (!sta || !sta->rate_ctrl_priv)
1677 return;
1678
1679 if (!priv->lq_mngr.lq_ready) {
1680 IWL_DEBUG_RATE("still rate scaling not ready\n");
1681 return;
1682 }
1683 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
1684
1685 tid = rs_tl_add_packet(lq_sta, hdr);
1686
1687 /*
1688 * Select rate-scale / modulation-mode table to work with in
1689 * the rest of this function: "search" if searching for better
1690 * modulation mode, or "active" if doing rate scaling within a mode.
1691 */
1692 if (!lq_sta->search_better_tbl)
1693 active_tbl = lq_sta->active_tbl;
1694 else
1695 active_tbl = 1 - lq_sta->active_tbl;
1696
1697 tbl = &(lq_sta->lq_info[active_tbl]);
1698 is_green = lq_sta->is_green;
1699
1700 /* current tx rate */
1701 index = sta->last_txrate_idx;
1702
1703 IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
1704 tbl->lq_type);
1705
1706 /* rates available for this association, and for modulation mode */
1707 rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
1708
1709 IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
1710
1711 /* mask with station rate restriction */
1712 if (is_legacy(tbl->lq_type)) {
1713 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1714 /* supp_rates has no CCK bits in A mode */
1715 rate_scale_index_msk = (u16) (rate_mask &
1716 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
1717 else
1718 rate_scale_index_msk = (u16) (rate_mask &
1719 lq_sta->supp_rates);
1720
1721 } else
1722 rate_scale_index_msk = rate_mask;
1723
1724 if (!rate_scale_index_msk)
1725 rate_scale_index_msk = rate_mask;
1726
1727 if (!((1 << index) & rate_scale_index_msk)) {
1728 IWL_ERROR("Current Rate is not valid\n");
1729 return;
1730 }
1731
1732 /* Get expected throughput table and history window for current rate */
1733 if (!tbl->expected_tpt) {
1734 IWL_ERROR("tbl->expected_tpt is NULL\n");
1735 return;
1736 }
1737
1738 window = &(tbl->win[index]);
1739
1740 /*
1741 * If there is not enough history to calculate actual average
1742 * throughput, keep analyzing results of more tx frames, without
1743 * changing rate or mode (bypass most of the rest of this function).
1744 * Set up new rate table in uCode only if old rate is not supported
1745 * in current association (use new rate found above).
1746 */
1747 fail_count = window->counter - window->success_counter;
1748 if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
1749 (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
1750 IWL_DEBUG_RATE("LQ: still below TH. succ=%d total=%d "
1751 "for index %d\n",
1752 window->success_counter, window->counter, index);
1753
1754 /* Can't calculate this yet; not enough history */
1755 window->average_tpt = IWL_INVALID_VALUE;
1756
1757 /* Should we stay with this modulation mode,
1758 * or search for a new one? */
1759 rs_stay_in_table(lq_sta);
1760
1761 goto out;
1762
1763 /* Else we have enough samples; calculate estimate of
1764 * actual average throughput */
1765 } else {
1766 /*FIXME:RS remove this else if we don't get this error*/
1767 if (window->average_tpt != ((window->success_ratio *
1768 tbl->expected_tpt[index] + 64) / 128)) {
1769 IWL_ERROR("expected_tpt should have been calculated"
1770 " by now\n");
1771 window->average_tpt = ((window->success_ratio *
1772 tbl->expected_tpt[index] + 64) / 128);
1773 }
1774 }
1775
1776 /* If we are searching for better modulation mode, check success. */
1777 if (lq_sta->search_better_tbl) {
1778
1779 /* If good success, continue using the "search" mode;
1780 * no need to send new link quality command, since we're
1781 * continuing to use the setup that we've been trying. */
1782 if (window->average_tpt > lq_sta->last_tpt) {
1783
1784 IWL_DEBUG_RATE("LQ: SWITCHING TO CURRENT TABLE "
1785 "suc=%d cur-tpt=%d old-tpt=%d\n",
1786 window->success_ratio,
1787 window->average_tpt,
1788 lq_sta->last_tpt);
1789
1790 if (!is_legacy(tbl->lq_type))
1791 lq_sta->enable_counter = 1;
1792
1793 /* Swap tables; "search" becomes "active" */
1794 lq_sta->active_tbl = active_tbl;
1795 current_tpt = window->average_tpt;
1796
1797 /* Else poor success; go back to mode in "active" table */
1798 } else {
1799
1800 IWL_DEBUG_RATE("LQ: GOING BACK TO THE OLD TABLE "
1801 "suc=%d cur-tpt=%d old-tpt=%d\n",
1802 window->success_ratio,
1803 window->average_tpt,
1804 lq_sta->last_tpt);
1805
1806 /* Nullify "search" table */
1807 tbl->lq_type = LQ_NONE;
1808
1809 /* Revert to "active" table */
1810 active_tbl = lq_sta->active_tbl;
1811 tbl = &(lq_sta->lq_info[active_tbl]);
1812
1813 /* Revert to "active" rate and throughput info */
1814 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1815 current_tpt = lq_sta->last_tpt;
1816
1817 /* Need to set up a new rate table in uCode */
1818 update_lq = 1;
1819 }
1820
1821 /* Either way, we've made a decision; modulation mode
1822 * search is done, allow rate adjustment next time. */
1823 lq_sta->search_better_tbl = 0;
1824 done_search = 1; /* Don't switch modes below! */
1825 goto lq_update;
1826 }
1827
1828 /* (Else) not in search of better modulation mode, try for better
1829 * starting rate, while staying in this mode. */
1830 high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
1831 tbl->lq_type);
1832 low = high_low & 0xff;
1833 high = (high_low >> 8) & 0xff;
1834
1835 sr = window->success_ratio;
1836
1837 /* Collect measured throughputs for current and adjacent rates */
1838 current_tpt = window->average_tpt;
1839 if (low != IWL_RATE_INVALID)
1840 low_tpt = tbl->win[low].average_tpt;
1841 if (high != IWL_RATE_INVALID)
1842 high_tpt = tbl->win[high].average_tpt;
1843
1844 scale_action = 0;
1845
1846 /* Too many failures, decrease rate */
1847 if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
1848 IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
1849 scale_action = -1;
1850
1851 /* No throughput measured yet for adjacent rates; try increase. */
1852 } else if ((low_tpt == IWL_INVALID_VALUE) &&
1853 (high_tpt == IWL_INVALID_VALUE)) {
1854
1855 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
1856 scale_action = 1;
1857 else if (low != IWL_RATE_INVALID)
1858 scale_action = -1;
1859 }
1860
1861 /* Both adjacent throughputs are measured, but neither one has better
1862 * throughput; we're using the best rate, don't change it! */
1863 else if ((low_tpt != IWL_INVALID_VALUE) &&
1864 (high_tpt != IWL_INVALID_VALUE) &&
1865 (low_tpt < current_tpt) &&
1866 (high_tpt < current_tpt))
1867 scale_action = 0;
1868
1869 /* At least one adjacent rate's throughput is measured,
1870 * and may have better performance. */
1871 else {
1872 /* Higher adjacent rate's throughput is measured */
1873 if (high_tpt != IWL_INVALID_VALUE) {
1874 /* Higher rate has better throughput */
1875 if (high_tpt > current_tpt &&
1876 sr >= IWL_RATE_INCREASE_TH) {
1877 scale_action = 1;
1878 } else {
1879 IWL_DEBUG_RATE
1880 ("decrease rate because of high tpt\n");
1881 scale_action = -1;
1882 }
1883
1884 /* Lower adjacent rate's throughput is measured */
1885 } else if (low_tpt != IWL_INVALID_VALUE) {
1886 /* Lower rate has better throughput */
1887 if (low_tpt > current_tpt) {
1888 IWL_DEBUG_RATE
1889 ("decrease rate because of low tpt\n");
1890 scale_action = -1;
1891 } else if (sr >= IWL_RATE_INCREASE_TH) {
1892 scale_action = 1;
1893 }
1894 }
1895 }
1896
1897 /* Sanity check; asked for decrease, but success rate or throughput
1898 * has been good at old rate. Don't change it. */
1899 if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
1900 ((sr > IWL_RATE_HIGH_TH) ||
1901 (current_tpt > (100 * tbl->expected_tpt[low]))))
1902 scale_action = 0;
1903
1904 switch (scale_action) {
1905 case -1:
1906 /* Decrease starting rate, update uCode's rate table */
1907 if (low != IWL_RATE_INVALID) {
1908 update_lq = 1;
1909 index = low;
1910 }
1911 break;
1912 case 1:
1913 /* Increase starting rate, update uCode's rate table */
1914 if (high != IWL_RATE_INVALID) {
1915 update_lq = 1;
1916 index = high;
1917 }
1918
1919 break;
1920 case 0:
1921 /* No change */
1922 default:
1923 break;
1924 }
1925
1926 IWL_DEBUG_RATE("choose rate scale index %d action %d low %d "
1927 "high %d type %d\n",
1928 index, scale_action, low, high, tbl->lq_type);
1929
1930 lq_update:
1931 /* Replace uCode's rate table for the destination station. */
1932 if (update_lq) {
1933 rate = rate_n_flags_from_tbl(tbl, index, is_green);
1934 rs_fill_link_cmd(priv, lq_sta, rate);
1935 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1936 }
1937
1938 /* Should we stay with this modulation mode, or search for a new one? */
1939 rs_stay_in_table(lq_sta);
1940
1941 /*
1942 * Search for new modulation mode if we're:
1943 * 1) Not changing rates right now
1944 * 2) Not just finishing up a search
1945 * 3) Allowing a new search
1946 */
1947 if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
1948 /* Save current throughput to compare with "search" throughput*/
1949 lq_sta->last_tpt = current_tpt;
1950
1951 /* Select a new "search" modulation mode to try.
1952 * If one is found, set up the new "search" table. */
1953 if (is_legacy(tbl->lq_type))
1954 rs_move_legacy_other(priv, lq_sta, conf, sta, index);
1955 else if (is_siso(tbl->lq_type))
1956 rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
1957 else
1958 rs_move_mimo_to_other(priv, lq_sta, conf, sta, index);
1959
1960 /* If new "search" mode was selected, set up in uCode table */
1961 if (lq_sta->search_better_tbl) {
1962 /* Access the "search" table, clear its history. */
1963 tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1964 for (i = 0; i < IWL_RATE_COUNT; i++)
1965 rs_rate_scale_clear_window(&(tbl->win[i]));
1966
1967 /* Use new "search" start rate */
1968 index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
1969
1970 IWL_DEBUG_RATE("Switch current mcs: %X index: %d\n",
1971 tbl->current_rate, index);
1972 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
1973 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
1974 }
1975
1976 /* If the "active" (non-search) mode was legacy,
1977 * and we've tried switching antennas,
1978 * but we haven't been able to try HT modes (not available),
1979 * stay with best antenna legacy modulation for a while
1980 * before next round of mode comparisons. */
1981 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
1982 if (is_legacy(tbl1->lq_type) &&
1983 (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)) &&
1984 (lq_sta->action_counter >= 1)) {
1985 lq_sta->action_counter = 0;
1986 IWL_DEBUG_RATE("LQ: STAY in legacy table\n");
1987 rs_set_stay_in_table(priv, 1, lq_sta);
1988 }
1989
1990 /* If we're in an HT mode, and all 3 mode switch actions
1991 * have been tried and compared, stay in this best modulation
1992 * mode for a while before next round of mode comparisons. */
1993 if (lq_sta->enable_counter &&
1994 (lq_sta->action_counter >= IWL_ACTION_LIMIT)) {
1995 if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
1996 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
1997 (tid != MAX_TID_COUNT)) {
1998 IWL_DEBUG_RATE("try to aggregate tid %d\n", tid);
1999 rs_tl_turn_on_agg(priv, tid, lq_sta, sta);
2000 }
2001 lq_sta->action_counter = 0;
2002 rs_set_stay_in_table(priv, 0, lq_sta);
2003 }
2004
2005 /*
2006 * Else, don't search for a new modulation mode.
2007 * Put new timestamp in stay-in-modulation-mode flush timer if:
2008 * 1) Not changing rates right now
2009 * 2) Not just finishing up a search
2010 * 3) flush timer is empty
2011 */
2012 } else {
2013 if ((!update_lq) && (!done_search) && (!lq_sta->flush_timer))
2014 lq_sta->flush_timer = jiffies;
2015 }
2016
2017 out:
2018 tbl->current_rate = rate_n_flags_from_tbl(tbl, index, is_green);
2019 i = index;
2020 sta->last_txrate_idx = i;
2021
2022 /* sta->txrate_idx is an index to A mode rates which start
2023 * at IWL_FIRST_OFDM_RATE
2024 */
2025 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2026 sta->txrate_idx = i - IWL_FIRST_OFDM_RATE;
2027 else
2028 sta->txrate_idx = i;
2029
2030 return;
2031 }
2032
2033
2034 static void rs_initialize_lq(struct iwl_priv *priv,
2035 struct ieee80211_conf *conf,
2036 struct sta_info *sta)
2037 {
2038 struct iwl4965_lq_sta *lq_sta;
2039 struct iwl4965_scale_tbl_info *tbl;
2040 int rate_idx;
2041 int i;
2042 u32 rate;
2043 u8 use_green = rs_use_green(priv, conf);
2044 u8 active_tbl = 0;
2045 u8 valid_tx_ant;
2046
2047 if (!sta || !sta->rate_ctrl_priv)
2048 goto out;
2049
2050 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2051 i = sta->last_txrate_idx;
2052
2053 if ((lq_sta->lq.sta_id == 0xff) &&
2054 (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
2055 goto out;
2056
2057 valid_tx_ant = priv->hw_params.valid_tx_ant;
2058
2059 if (!lq_sta->search_better_tbl)
2060 active_tbl = lq_sta->active_tbl;
2061 else
2062 active_tbl = 1 - lq_sta->active_tbl;
2063
2064 tbl = &(lq_sta->lq_info[active_tbl]);
2065
2066 if ((i < 0) || (i >= IWL_RATE_COUNT))
2067 i = 0;
2068
2069 /* FIXME:RS: This is also wrong in 4965 */
2070 rate = iwl_rates[i].plcp;
2071 rate |= RATE_MCS_ANT_B_MSK;
2072 rate &= ~RATE_MCS_ANT_A_MSK;
2073
2074 if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2075 rate |= RATE_MCS_CCK_MSK;
2076
2077 tbl->ant_type = ANT_B;
2078 rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2079 if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2080 rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2081
2082 rate = rate_n_flags_from_tbl(tbl, rate_idx, use_green);
2083 tbl->current_rate = rate;
2084 rs_set_expected_tpt_table(lq_sta, tbl);
2085 rs_fill_link_cmd(NULL, lq_sta, rate);
2086 iwl_send_lq_cmd(priv, &lq_sta->lq, CMD_ASYNC);
2087 out:
2088 return;
2089 }
2090
2091 static void rs_get_rate(void *priv_rate, struct net_device *dev,
2092 struct ieee80211_supported_band *sband,
2093 struct sk_buff *skb,
2094 struct rate_selection *sel)
2095 {
2096
2097 int i;
2098 struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
2099 struct ieee80211_conf *conf = &local->hw.conf;
2100 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2101 struct sta_info *sta;
2102 u16 fc;
2103 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2104 struct iwl4965_lq_sta *lq_sta;
2105
2106 IWL_DEBUG_RATE_LIMIT("rate scale calculate new rate for skb\n");
2107
2108 rcu_read_lock();
2109
2110 sta = sta_info_get(local, hdr->addr1);
2111
2112 /* Send management frames and broadcast/multicast data using lowest
2113 * rate. */
2114 fc = le16_to_cpu(hdr->frame_control);
2115 if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1) ||
2116 !sta || !sta->rate_ctrl_priv) {
2117 sel->rate_idx = rate_lowest_index(local, sband, sta);
2118 goto out;
2119 }
2120
2121 lq_sta = (struct iwl4965_lq_sta *)sta->rate_ctrl_priv;
2122 i = sta->last_txrate_idx;
2123
2124 if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) &&
2125 !lq_sta->ibss_sta_added) {
2126 u8 sta_id = iwl_find_station(priv, hdr->addr1);
2127 DECLARE_MAC_BUF(mac);
2128
2129 if (sta_id == IWL_INVALID_STATION) {
2130 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2131 print_mac(mac, hdr->addr1));
2132 sta_id = iwl_add_station_flags(priv, hdr->addr1,
2133 0, CMD_ASYNC, NULL);
2134 }
2135 if ((sta_id != IWL_INVALID_STATION)) {
2136 lq_sta->lq.sta_id = sta_id;
2137 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2138 lq_sta->ibss_sta_added = 1;
2139 rs_initialize_lq(priv, conf, sta);
2140 }
2141 if (!lq_sta->ibss_sta_added)
2142 goto done;
2143 }
2144
2145 done:
2146 if ((i < 0) || (i > IWL_RATE_COUNT)) {
2147 sel->rate_idx = rate_lowest_index(local, sband, sta);
2148 goto out;
2149 }
2150
2151 if (sband->band == IEEE80211_BAND_5GHZ)
2152 i -= IWL_FIRST_OFDM_RATE;
2153 sel->rate_idx = i;
2154 out:
2155 rcu_read_unlock();
2156 }
2157
2158 static void *rs_alloc_sta(void *priv_rate, gfp_t gfp)
2159 {
2160 struct iwl4965_lq_sta *lq_sta;
2161 struct iwl_priv *priv;
2162 int i, j;
2163
2164 priv = (struct iwl_priv *)priv_rate;
2165 IWL_DEBUG_RATE("create station rate scale window\n");
2166
2167 lq_sta = kzalloc(sizeof(struct iwl4965_lq_sta), gfp);
2168
2169 if (lq_sta == NULL)
2170 return NULL;
2171 lq_sta->lq.sta_id = 0xff;
2172
2173
2174 for (j = 0; j < LQ_SIZE; j++)
2175 for (i = 0; i < IWL_RATE_COUNT; i++)
2176 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2177
2178 return lq_sta;
2179 }
2180
2181 static void rs_rate_init(void *priv_rate, void *priv_sta,
2182 struct ieee80211_local *local,
2183 struct sta_info *sta)
2184 {
2185 int i, j;
2186 struct ieee80211_conf *conf = &local->hw.conf;
2187 struct ieee80211_supported_band *sband;
2188 struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
2189 struct iwl4965_lq_sta *lq_sta = priv_sta;
2190
2191 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
2192
2193 lq_sta->flush_timer = 0;
2194 lq_sta->supp_rates = sta->supp_rates[sband->band];
2195 sta->txrate_idx = 3;
2196 for (j = 0; j < LQ_SIZE; j++)
2197 for (i = 0; i < IWL_RATE_COUNT; i++)
2198 rs_rate_scale_clear_window(&(lq_sta->lq_info[j].win[i]));
2199
2200 IWL_DEBUG_RATE("LQ: *** rate scale global init ***\n");
2201 /* TODO: what is a good starting rate for STA? About middle? Maybe not
2202 * the lowest or the highest rate.. Could consider using RSSI from
2203 * previous packets? Need to have IEEE 802.1X auth succeed immediately
2204 * after assoc.. */
2205
2206 lq_sta->ibss_sta_added = 0;
2207 if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
2208 u8 sta_id = iwl_find_station(priv, sta->addr);
2209 DECLARE_MAC_BUF(mac);
2210
2211 /* for IBSS the call are from tasklet */
2212 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2213 print_mac(mac, sta->addr));
2214
2215 if (sta_id == IWL_INVALID_STATION) {
2216 IWL_DEBUG_RATE("LQ: ADD station %s\n",
2217 print_mac(mac, sta->addr));
2218 sta_id = iwl_add_station_flags(priv, sta->addr,
2219 0, CMD_ASYNC, NULL);
2220 }
2221 if ((sta_id != IWL_INVALID_STATION)) {
2222 lq_sta->lq.sta_id = sta_id;
2223 lq_sta->lq.rs_table[0].rate_n_flags = 0;
2224 }
2225 /* FIXME: this is w/a remove it later */
2226 priv->assoc_station_added = 1;
2227 }
2228
2229 /* Find highest tx rate supported by hardware and destination station */
2230 for (i = 0; i < sband->n_bitrates; i++)
2231 if (sta->supp_rates[sband->band] & BIT(i))
2232 sta->txrate_idx = i;
2233
2234 sta->last_txrate_idx = sta->txrate_idx;
2235 /* WTF is with this bogus comment? A doesn't have cck rates */
2236 /* For MODE_IEEE80211A, cck rates are at end of rate table */
2237 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
2238 sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2239
2240 lq_sta->is_dup = 0;
2241 lq_sta->is_green = rs_use_green(priv, conf);
2242 lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2243 lq_sta->active_rate_basic = priv->active_rate_basic;
2244 lq_sta->band = priv->band;
2245 /*
2246 * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2247 * supp_rates[] does not; shift to convert format, force 9 MBits off.
2248 */
2249 lq_sta->active_siso_rate = conf->ht_conf.supp_mcs_set[0] << 1;
2250 lq_sta->active_siso_rate |= conf->ht_conf.supp_mcs_set[0] & 0x1;
2251 lq_sta->active_siso_rate &= ~((u16)0x2);
2252 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2253
2254 /* Same here */
2255 lq_sta->active_mimo2_rate = conf->ht_conf.supp_mcs_set[1] << 1;
2256 lq_sta->active_mimo2_rate |= conf->ht_conf.supp_mcs_set[1] & 0x1;
2257 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2258 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2259
2260 lq_sta->active_mimo3_rate = conf->ht_conf.supp_mcs_set[2] << 1;
2261 lq_sta->active_mimo3_rate |= conf->ht_conf.supp_mcs_set[2] & 0x1;
2262 lq_sta->active_mimo3_rate &= ~((u16)0x2);
2263 lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2264
2265 IWL_DEBUG_RATE("SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2266 lq_sta->active_siso_rate,
2267 lq_sta->active_mimo2_rate,
2268 lq_sta->active_mimo3_rate);
2269
2270 /* These values will be overriden later */
2271 lq_sta->lq.general_params.single_stream_ant_msk = ANT_A;
2272 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2273
2274 /* as default allow aggregation for all tids */
2275 lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2276 #ifdef CONFIG_MAC80211_DEBUGFS
2277 lq_sta->drv = priv;
2278 #endif
2279
2280 if (priv->assoc_station_added)
2281 priv->lq_mngr.lq_ready = 1;
2282
2283 rs_initialize_lq(priv, conf, sta);
2284 }
2285
2286 static void rs_fill_link_cmd(const struct iwl_priv *priv,
2287 struct iwl4965_lq_sta *lq_sta,
2288 u32 new_rate)
2289 {
2290 struct iwl4965_scale_tbl_info tbl_type;
2291 int index = 0;
2292 int rate_idx;
2293 int repeat_rate = 0;
2294 u8 ant_toggle_cnt = 0;
2295 u8 use_ht_possible = 1;
2296 u8 valid_tx_ant = 0;
2297 struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2298
2299 /* Override starting rate (index 0) if needed for debug purposes */
2300 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2301
2302 /* Interpret new_rate (rate_n_flags) */
2303 memset(&tbl_type, 0, sizeof(tbl_type));
2304 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2305 &tbl_type, &rate_idx);
2306
2307 /* How many times should we repeat the initial rate? */
2308 if (is_legacy(tbl_type.lq_type)) {
2309 ant_toggle_cnt = 1;
2310 repeat_rate = IWL_NUMBER_TRY;
2311 } else {
2312 repeat_rate = IWL_HT_NUMBER_TRY;
2313 }
2314
2315 lq_cmd->general_params.mimo_delimiter =
2316 is_mimo(tbl_type.lq_type) ? 1 : 0;
2317
2318 /* Fill 1st table entry (index 0) */
2319 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2320
2321 if (num_of_ant(tbl_type.ant_type) == 1) {
2322 lq_cmd->general_params.single_stream_ant_msk =
2323 tbl_type.ant_type;
2324 } else if (num_of_ant(tbl_type.ant_type) == 2) {
2325 lq_cmd->general_params.dual_stream_ant_msk =
2326 tbl_type.ant_type;
2327 } /* otherwise we don't modify the existing value */
2328
2329 index++;
2330 repeat_rate--;
2331
2332 if (priv)
2333 valid_tx_ant = priv->hw_params.valid_tx_ant;
2334
2335 /* Fill rest of rate table */
2336 while (index < LINK_QUAL_MAX_RETRY_NUM) {
2337 /* Repeat initial/next rate.
2338 * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2339 * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2340 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2341 if (is_legacy(tbl_type.lq_type)) {
2342 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2343 ant_toggle_cnt++;
2344 else if (priv &&
2345 rs_toggle_antenna(valid_tx_ant,
2346 &new_rate, &tbl_type))
2347 ant_toggle_cnt = 1;
2348 }
2349
2350 /* Override next rate if needed for debug purposes */
2351 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2352
2353 /* Fill next table entry */
2354 lq_cmd->rs_table[index].rate_n_flags =
2355 cpu_to_le32(new_rate);
2356 repeat_rate--;
2357 index++;
2358 }
2359
2360 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
2361 &rate_idx);
2362
2363 /* Indicate to uCode which entries might be MIMO.
2364 * If initial rate was MIMO, this will finally end up
2365 * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
2366 if (is_mimo(tbl_type.lq_type))
2367 lq_cmd->general_params.mimo_delimiter = index;
2368
2369 /* Get next rate */
2370 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
2371 use_ht_possible);
2372
2373 /* How many times should we repeat the next rate? */
2374 if (is_legacy(tbl_type.lq_type)) {
2375 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2376 ant_toggle_cnt++;
2377 else if (priv &&
2378 rs_toggle_antenna(valid_tx_ant,
2379 &new_rate, &tbl_type))
2380 ant_toggle_cnt = 1;
2381
2382 repeat_rate = IWL_NUMBER_TRY;
2383 } else {
2384 repeat_rate = IWL_HT_NUMBER_TRY;
2385 }
2386
2387 /* Don't allow HT rates after next pass.
2388 * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
2389 use_ht_possible = 0;
2390
2391 /* Override next rate if needed for debug purposes */
2392 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2393
2394 /* Fill next table entry */
2395 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2396
2397 index++;
2398 repeat_rate--;
2399 }
2400
2401 lq_cmd->agg_params.agg_frame_cnt_limit = 64;
2402 lq_cmd->agg_params.agg_dis_start_th = 3;
2403 lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
2404 }
2405
2406 static void *rs_alloc(struct ieee80211_local *local)
2407 {
2408 return local->hw.priv;
2409 }
2410 /* rate scale requires free function to be implemented */
2411 static void rs_free(void *priv_rate)
2412 {
2413 return;
2414 }
2415
2416 static void rs_clear(void *priv_rate)
2417 {
2418 struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
2419
2420 IWL_DEBUG_RATE("enter\n");
2421
2422 priv->lq_mngr.lq_ready = 0;
2423
2424 IWL_DEBUG_RATE("leave\n");
2425 }
2426
2427 static void rs_free_sta(void *priv_rate, void *priv_sta)
2428 {
2429 struct iwl4965_lq_sta *lq_sta = priv_sta;
2430 struct iwl_priv *priv;
2431
2432 priv = (struct iwl_priv *)priv_rate;
2433 IWL_DEBUG_RATE("enter\n");
2434 kfree(lq_sta);
2435 IWL_DEBUG_RATE("leave\n");
2436 }
2437
2438
2439 #ifdef CONFIG_MAC80211_DEBUGFS
2440 static int open_file_generic(struct inode *inode, struct file *file)
2441 {
2442 file->private_data = inode->i_private;
2443 return 0;
2444 }
2445 static void rs_dbgfs_set_mcs(struct iwl4965_lq_sta *lq_sta,
2446 u32 *rate_n_flags, int index)
2447 {
2448 struct iwl_priv *priv;
2449
2450 priv = lq_sta->drv;
2451 if (lq_sta->dbg_fixed_rate) {
2452 if (index < 12) {
2453 *rate_n_flags = lq_sta->dbg_fixed_rate;
2454 } else {
2455 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2456 *rate_n_flags = 0x800D;
2457 else
2458 *rate_n_flags = 0x820A;
2459 }
2460 IWL_DEBUG_RATE("Fixed rate ON\n");
2461 } else {
2462 IWL_DEBUG_RATE("Fixed rate OFF\n");
2463 }
2464 }
2465
2466 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
2467 const char __user *user_buf, size_t count, loff_t *ppos)
2468 {
2469 struct iwl4965_lq_sta *lq_sta = file->private_data;
2470 struct iwl_priv *priv;
2471 char buf[64];
2472 int buf_size;
2473 u32 parsed_rate;
2474
2475 priv = lq_sta->drv;
2476 memset(buf, 0, sizeof(buf));
2477 buf_size = min(count, sizeof(buf) - 1);
2478 if (copy_from_user(buf, user_buf, buf_size))
2479 return -EFAULT;
2480
2481 if (sscanf(buf, "%x", &parsed_rate) == 1)
2482 lq_sta->dbg_fixed_rate = parsed_rate;
2483 else
2484 lq_sta->dbg_fixed_rate = 0;
2485
2486 lq_sta->active_legacy_rate = 0x0FFF; /* 1 - 54 MBits, includes CCK */
2487 lq_sta->active_siso_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2488 lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2489 lq_sta->active_mimo3_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
2490
2491 IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
2492 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
2493
2494 if (lq_sta->dbg_fixed_rate) {
2495 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
2496 iwl_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC);
2497 }
2498
2499 return count;
2500 }
2501
2502 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
2503 char __user *user_buf, size_t count, loff_t *ppos)
2504 {
2505 char buff[1024];
2506 int desc = 0;
2507 int i = 0;
2508
2509 struct iwl4965_lq_sta *lq_sta = file->private_data;
2510
2511 desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
2512 desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
2513 lq_sta->total_failed, lq_sta->total_success,
2514 lq_sta->active_legacy_rate);
2515 desc += sprintf(buff+desc, "fixed rate 0x%X\n",
2516 lq_sta->dbg_fixed_rate);
2517 desc += sprintf(buff+desc, "general:"
2518 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
2519 lq_sta->lq.general_params.flags,
2520 lq_sta->lq.general_params.mimo_delimiter,
2521 lq_sta->lq.general_params.single_stream_ant_msk,
2522 lq_sta->lq.general_params.dual_stream_ant_msk);
2523
2524 desc += sprintf(buff+desc, "agg:"
2525 "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
2526 le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
2527 lq_sta->lq.agg_params.agg_dis_start_th,
2528 lq_sta->lq.agg_params.agg_frame_cnt_limit);
2529
2530 desc += sprintf(buff+desc,
2531 "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
2532 lq_sta->lq.general_params.start_rate_index[0],
2533 lq_sta->lq.general_params.start_rate_index[1],
2534 lq_sta->lq.general_params.start_rate_index[2],
2535 lq_sta->lq.general_params.start_rate_index[3]);
2536
2537
2538 for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
2539 desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
2540 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
2541
2542 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2543 }
2544
2545 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
2546 .write = rs_sta_dbgfs_scale_table_write,
2547 .read = rs_sta_dbgfs_scale_table_read,
2548 .open = open_file_generic,
2549 };
2550 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
2551 char __user *user_buf, size_t count, loff_t *ppos)
2552 {
2553 char buff[1024];
2554 int desc = 0;
2555 int i, j;
2556
2557 struct iwl4965_lq_sta *lq_sta = file->private_data;
2558 for (i = 0; i < LQ_SIZE; i++) {
2559 desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
2560 "rate=0x%X\n",
2561 lq_sta->active_tbl == i?"*":"x",
2562 lq_sta->lq_info[i].lq_type,
2563 lq_sta->lq_info[i].is_SGI,
2564 lq_sta->lq_info[i].is_fat,
2565 lq_sta->lq_info[i].is_dup,
2566 lq_sta->lq_info[i].current_rate);
2567 for (j = 0; j < IWL_RATE_COUNT; j++) {
2568 desc += sprintf(buff+desc,
2569 "counter=%d success=%d %%=%d\n",
2570 lq_sta->lq_info[i].win[j].counter,
2571 lq_sta->lq_info[i].win[j].success_counter,
2572 lq_sta->lq_info[i].win[j].success_ratio);
2573 }
2574 }
2575 return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
2576 }
2577
2578 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
2579 .read = rs_sta_dbgfs_stats_table_read,
2580 .open = open_file_generic,
2581 };
2582
2583 static void rs_add_debugfs(void *priv, void *priv_sta,
2584 struct dentry *dir)
2585 {
2586 struct iwl4965_lq_sta *lq_sta = priv_sta;
2587 lq_sta->rs_sta_dbgfs_scale_table_file =
2588 debugfs_create_file("rate_scale_table", 0600, dir,
2589 lq_sta, &rs_sta_dbgfs_scale_table_ops);
2590 lq_sta->rs_sta_dbgfs_stats_table_file =
2591 debugfs_create_file("rate_stats_table", 0600, dir,
2592 lq_sta, &rs_sta_dbgfs_stats_table_ops);
2593 lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
2594 debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
2595 &lq_sta->tx_agg_tid_en);
2596
2597 }
2598
2599 static void rs_remove_debugfs(void *priv, void *priv_sta)
2600 {
2601 struct iwl4965_lq_sta *lq_sta = priv_sta;
2602 debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
2603 debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
2604 debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
2605 }
2606 #endif
2607
2608 static struct rate_control_ops rs_ops = {
2609 .module = NULL,
2610 .name = RS_NAME,
2611 .tx_status = rs_tx_status,
2612 .get_rate = rs_get_rate,
2613 .rate_init = rs_rate_init,
2614 .clear = rs_clear,
2615 .alloc = rs_alloc,
2616 .free = rs_free,
2617 .alloc_sta = rs_alloc_sta,
2618 .free_sta = rs_free_sta,
2619 #ifdef CONFIG_MAC80211_DEBUGFS
2620 .add_sta_debugfs = rs_add_debugfs,
2621 .remove_sta_debugfs = rs_remove_debugfs,
2622 #endif
2623 };
2624
2625 int iwl4965_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
2626 {
2627 struct ieee80211_local *local = hw_to_local(hw);
2628 struct iwl_priv *priv = hw->priv;
2629 struct iwl4965_lq_sta *lq_sta;
2630 struct sta_info *sta;
2631 int cnt = 0, i;
2632 u32 samples = 0, success = 0, good = 0;
2633 unsigned long now = jiffies;
2634 u32 max_time = 0;
2635 u8 lq_type, antenna;
2636
2637 rcu_read_lock();
2638
2639 sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
2640 if (!sta || !sta->rate_ctrl_priv) {
2641 if (sta)
2642 IWL_DEBUG_RATE("leave - no private rate data!\n");
2643 else
2644 IWL_DEBUG_RATE("leave - no station!\n");
2645 rcu_read_unlock();
2646 return sprintf(buf, "station %d not found\n", sta_id);
2647 }
2648
2649 lq_sta = (void *)sta->rate_ctrl_priv;
2650
2651 lq_type = lq_sta->lq_info[lq_sta->active_tbl].lq_type;
2652 antenna = lq_sta->lq_info[lq_sta->active_tbl].ant_type;
2653
2654 if (is_legacy(lq_type))
2655 i = IWL_RATE_54M_INDEX;
2656 else
2657 i = IWL_RATE_60M_INDEX;
2658 while (1) {
2659 u64 mask;
2660 int j;
2661 int active = lq_sta->active_tbl;
2662
2663 cnt +=
2664 sprintf(&buf[cnt], " %2dMbs: ", iwl_rates[i].ieee / 2);
2665
2666 mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
2667 for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
2668 buf[cnt++] =
2669 (lq_sta->lq_info[active].win[i].data & mask)
2670 ? '1' : '0';
2671
2672 samples += lq_sta->lq_info[active].win[i].counter;
2673 good += lq_sta->lq_info[active].win[i].success_counter;
2674 success += lq_sta->lq_info[active].win[i].success_counter *
2675 iwl_rates[i].ieee;
2676
2677 if (lq_sta->lq_info[active].win[i].stamp) {
2678 int delta =
2679 jiffies_to_msecs(now -
2680 lq_sta->lq_info[active].win[i].stamp);
2681
2682 if (delta > max_time)
2683 max_time = delta;
2684
2685 cnt += sprintf(&buf[cnt], "%5dms\n", delta);
2686 } else
2687 buf[cnt++] = '\n';
2688
2689 j = iwl4965_get_prev_ieee_rate(i);
2690 if (j == i)
2691 break;
2692 i = j;
2693 }
2694
2695 /*
2696 * Display the average rate of all samples taken.
2697 * NOTE: We multiply # of samples by 2 since the IEEE measurement
2698 * added from iwl_rates is actually 2X the rate.
2699 */
2700 if (samples)
2701 cnt += sprintf(&buf[cnt],
2702 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
2703 "%3d%% success (%d good packets over %d tries)\n",
2704 success / (2 * samples), (success * 5 / samples) % 10,
2705 max_time, good * 100 / samples, good, samples);
2706 else
2707 cnt += sprintf(&buf[cnt], "\nAverage rate: 0Mbs\n");
2708
2709 cnt += sprintf(&buf[cnt], "\nrate scale type %d antenna %d "
2710 "active_search %d rate index %d\n", lq_type, antenna,
2711 lq_sta->search_better_tbl, sta->last_txrate_idx);
2712
2713 rcu_read_unlock();
2714 return cnt;
2715 }
2716
2717 void iwl4965_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
2718 {
2719 struct iwl_priv *priv = hw->priv;
2720
2721 priv->lq_mngr.lq_ready = 1;
2722 }
2723
2724 int iwl4965_rate_control_register(void)
2725 {
2726 return ieee80211_rate_control_register(&rs_ops);
2727 }
2728
2729 void iwl4965_rate_control_unregister(void)
2730 {
2731 ieee80211_rate_control_unregister(&rs_ops);
2732 }
2733
CJK support for tty framebuffer vt